On the design of high-linear and low-noise two-branch channelized active bandpass filters

A novel systematic and consistent method for two-branch channelized active bandpass filter design is presented. The design technique is obtained starting from a rigorous and detailed theoretical analysis of this type of filter, undeveloped to date. In the proposed method, the values of key design parameters are established directly from the initial specifications by using a simple set of design formulas. The design procedure is validated with construction and measurement of a specific two-branch channelized filter prototype at 2.5 GHz in microstrip technology. Other relevant factors in active filter design techniques, such as nonlinear and noise performance, are also considered in the experimental characterization of the filter prototype.